****** money

I won soo I did a withdrawal and left some in the account 200 and something I went back and log in it's gone soo I wondered how come I deposited again I played and won left my account with 500 and something went back again all of it gone phone customer care lady told me that it looked like someone kept spinning the reel on the game I was playing but on my side I can see 1 voucher withdrawal now the money is gone she says I must just change my password how do I know this won't happen again and what about my money